[Bug 1452974] [NEW] Update 14.10 to 15.04 failed - Unsolvable while calculating upgrade

[Dillon]

Public bug reported:

Ubuntu Release: 
:~$ lsb_release -rd
Description:	Ubuntu 14.10
Release:	14.10

Version of Package: 
:~$ apt-cache policy pkgme
pkgme:
  Installed: (none)
  Candidate: 0.1+bzr114
  Version table:
     0.1+bzr114 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages

Expected: 
When option to Upgrade to 15.04 was available and after selecting the upgrade button, I expected package upgrade to occur as it is listed as supported in: http://ubuntugnome.org/ubuntu-gnome-15-04-is-released/

What actually happened:
Upgrade went through preparations during upgrade to check, which successfully completes.  Provides warning about 3rd party entries, which is fine. Preparing to upgrade completes successfully. Starts download for new software channels of 53, which appears to complete successfully, but error occurs shortly after 'checking package manager'. It then throws error:
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
[List of what its caused by]
[How to report if none apply]

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubuntu-release-upgrader-core 1:14.10.10
ProcVersionSignature: Ubuntu 3.16.0-37.51-generic 3.16.7-ckt9
Uname: Linux 3.16.0-37-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.4
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Thu May  7 20:46:19 2015
InstallationDate: Installed on 2015-03-27 (41 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to utopic on 2015-05-08 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade utopic

** Attachment added: "apt.log"
   https://bugs.launchpad.net/bugs/1452974/+attachment/4393336/+files/apt.log

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https://bugs.launchpad.net/bugs/1452974

Title:
  Update 14.10 to 15.04 failed - Unsolvable while calculating upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Ubuntu Release: 
  :~$ lsb_release -rd
  Description:	Ubuntu 14.10
  Release:	14.10

  Version of Package: 
  :~$ apt-cache policy pkgme
  pkgme:
    Installed: (none)
    Candidate: 0.1+bzr114
    Version table:
       0.1+bzr114 0
          500 http://us.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages

  Expected: 
  When option to Upgrade to 15.04 was available and after selecting the upgrade button, I expected package upgrade to occur as it is listed as supported in: http://ubuntugnome.org/ubuntu-gnome-15-04-is-released/

  What actually happened:
  Upgrade went through preparations during upgrade to check, which successfully completes.  Provides warning about 3rd party entries, which is fine. Preparing to upgrade completes successfully. Starts download for new software channels of 53, which appears to complete successfully, but error occurs shortly after 'checking package manager'. It then throws error:
  Could not calculate the upgrade
  An unresolvable problem occurred while calculating the upgrade.
  [List of what its caused by]
  [How to report if none apply]

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-37.51-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-37-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Thu May  7 20:46:19 2015
  InstallationDate: Installed on 2015-03-27 (41 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-05-08 (0 days ago)
  VarLogDistupgradeTermlog:

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